Here is a list of everyone currently announced as playing at Summerfest, according to published Internet sources and Summerfest news releases. All performances are on grounds stages, unless otherwise indicated. Not all shows have been confirmed by Summerfest, which means there's a chance some sources have run tentative bookings. So, of course, these are subject to change.

Thursday June 26 --Stevie Wonder, Marcus Amphitheater
Thursday June 26 -- Cowboy Mouth
Thursday June 26 -- Cross Canadian Ragweed
Thursday June 26 -- Little Big Town
Thursday June 26 -- Paolo Nutini
Thursday June 26 -- Ruby Jane

Friday, June 27 -- Rush, Marcus Amphitheater
Friday, June 27 -- Phil Vassar
Friday, June 27 -- Terrance Simien & The Zydeco Experience

Saturday, June 28 -- Dashboard Confessional (solo)
Saturday, June 28 -- BoDeans
Saturday, June 28 -- Trace Adkins

Sunday, June 29 -- Joe Cocker, Marcus Amphitheater
Sunday, June 29 -- Steve Miller Band, Marcus Amphitheater
Sunday, June 29 -- Bonerama
Sunday, June 29 -- Galactic
Sunday, June 29 -- Miranda Lambert
Sunday, June 29 -- Jack's Mannequin

Monday, June 30 -- Matisyahu
Monday, June 30 -- Rascal Flatts, Marcus Amphitheater
Monday, June 30 -- Taylor Swift, Marcus Amphitheater
Monday, June 30 -- Bootsy Collins

Tuesday, July 1 -- Alicia Keys, Marcus Amphitheater
Tuesday, July 1 -- Keller Williams
Tuesday, July 1 -- Neil Giraldo
Tuesday, July 1 -- Otis Taylor Band
Tuesday, July 1 -- Pat Benatar
Tuesday, July 1 -- Railroad Earth
Tuesday, July 1 -- State Radio
Tuesday, July 1 -- Zappa Plays Zappa

Wednesday, July 2 -- Brett Dennen, Marcus Amphitheater
Wednesday, July 2 -- Colbie Caillat, Marcus Amphitheater
Wednesday, July 2 -- John Mayer, Marcus Amphitheater
Wednesday, July 2 -- Creedence Clearwater Revisited
Wednesday, July 2 -- The Crystal Method (DJ set)
Wednesday, July 2 -- O.A.R.

Thursday July 3 -- Halfway To Hazard, Marcus Amphitheater
Thursday July 3 -- Jason Aldean Marcus Amphitheater
Thursday July 3 -- Tim McGraw, Marcus Amphitheater
Thursday July 3 -- Plain White T's
Thursday July 3 -- The Frantic
Thursday July 3 -- This World Fair

Friday, July 4 -- Derek Trucks & Susan Tedeschi Soul Stew Revival
Friday. July 4 -- Phil Lesh and Friends
Friday, July 4 -- The Roots
Friday, July 4 -- This World Fair
Friday, July 4 -- Stone Temple Pilots, Marcus Amphitheater

Saturday, July 5 -- Steve Winwood, Marcus Amphitheater
Saturday, July 5 -- Tom Petty & The Heartbreakers, Marcus Amphitheater
Saturday, July 5 -- Steel Pulse
Saturday, July 5 -- This World Fair

Sunday, July 6 -- Jonas Brothers, Marcus Amphitheater
Sunday, July 6 -- 311

Summerfest announced that some other acts, including Gomez, Willie Colon, The Polyphonic Spree, The Bravery, Cheap Trick, Earth, Wind & Fire, Lucinda Williams and Thievery Corporation, were booked on grounds stages, but specific dates for the shows have not surfaced.